ActiveMQ笔记（三）---JMS可靠性

1、消息可靠性

消息默认是持久化的

 

 

2、队列的持久化

 

 

3、TOPIC的持久化

一定要运行消费者，等于向MQ注册，然后再运行生产者，此时无论消费者在不在线，都会接收到，不在线的话，下次连接也会接收到消息

消费者：

import org.apache.activemq.ActiveMQConnectionFactory;

import javax.jms.*;
import java.io.IOException;

/**
 * Created by Administrator on 2020/2/11.
 */
public class JmsConsumerTopicPersist {

    public static final  String ACTIVE_MQ_URL = "tcp://127.0.0.1:61616";
    public static final  String TOPIC_NAME = "topic-persist";
    public static void main(String[] args) throws JMSException, IOException {
        System.out.println("消息订阅者z3");
        //1、创建连接工厂,按照给定的url地址，采用默认的用户名和密码
        ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(ACTIVE_MQ_URL);
        //2、通过连接工厂，获取连接的connection并启动访问
        QueueConnection connection = connectionFactory.createQueueConnection();
        connection.setClientID("z3");

        //3创建会话session (事物、签收)
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

        //4、创建目的地具体是主題
        Topic topic = session.createTopic(TOPIC_NAME);
        TopicSubscriber topicSubscriber = session.createDurableSubscriber(topic, "备注信息--");
        connection.start();
        Message message = topicSubscriber.receive();
        while( null != message){
            TextMessage textMessage = (TextMessage) message;
            System.out.println("收到持久化的Topic--" + textMessage.getText());
            message = topicSubscriber.receive(4000l);
        }
        session.close();
        connection.close();
    }
}

View Code

生产者：

import org.apache.activemq.ActiveMQConnectionFactory;

import javax.jms.*;

/**
 * Created by Administrator on 2020/2/11.
 */
public class JmsProduceTopicPersist {

    public static final  String ACTIVE_MQ_URL = "tcp://127.0.0.1:61616";
    public static final  String TOPIC_NAME = "topic-persist";
    public static void main(String[] args) throws JMSException {
        //1、创建连接工厂,按照给定的url地址，采用默认的用户名和密码
        ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(ACTIVE_MQ_URL);
        QueueConnection connection = connectionFactory.createQueueConnection();

        //3创建会话session (事物、签收)
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

        //4、创建目的地具体是主題
        Topic topic = session.createTopic(TOPIC_NAME);
        // 5\创建消息的生产者
        MessageProducer messageProducer = session.createProducer(topic);
        // 设置主体持久化
        messageProducer.setDeliveryMode(DeliveryMode.PERSISTENT);
        connection.start();
        for (int i =0; i<3;i++){
            // 创建消息
            TextMessage textMessage = session.createTextMessage("Topic-message=" + i);
           // 通过messageProducer发送消息
            messageProducer.send(textMessage);
        }
        // 6、关闭资源
        messageProducer.close();
        session.close();
        connection.close();
        System.out.println("Topic消息发送到MQ完成");
    }
}

View Code